When i saw that video at the age of 13, i realized what the word skill really meant
the way he attacks his opponent and don't even realize he is attacking them shows how subtile one can be. So subtile that the player under attack notices the feral only when he is dead
or even the fact that the camera point of view is zoomed, it was as if that feral didnt need to see what was around him; only what was in front of him matter. As if he could feel with some kind of animal instinct his ennemies movement withotu looking at them.
You might think sometimes that his movement are maybe a little ... hesitant, even random: but that's where his genuis lies. He makes you think that you are not in danger and that he is harmless, but you end up dead before realizing what happened to you.

That feral was a real feral, trusting his guts and knowing how to penetrate people's mind in order to stay in the shadow even while he kills his opponent